| Jorgenson Machinery offers Thermocouples and RTD (Resistance Temperature Detector) probes in different styles for various applications. Type “J” thermocouples are the thermocouple of choice for most plastics processors and other medium-duty environments. Styles of both thermocouple and RTD probes include adjustable bayonet thermocouple, fixed length bayonet thermocouple, compression fitting thermocouple, plastic melt type thermocouple for extruders, and bolt type thermocouple. Additional thermocouples include surface thermocouple and spade type thermocouple. RTDs are temperature sensing devices that react to a change in temperature based on the resistance change in metal.
The thermocouple sensor is the junction of two dissimilar thermocouple grade wires: A voltage is generated when heat is at this junction in the thermocouple. The voltage is proportional to the thermocouple junction temperature, which can in turn lead by the electronic control. Thermocouples and RTD probes appear similar to each other. Both thermocouples and RTD's have a 3/16” diameter stainless steel protective probe and both thermocouples and rtd's can be manufactured with 1/8”, 1/4”, or 3/8” stainless-steel tubing.
THERMOCOUPLE ADVANTAGES
- High temperature capabilities in thermocouples
- Rugged construction – no bulb to break under stress or vibration with thermocouples
- Thermocouples are quick to respond to temperature changes
- Thermocouples are very versatile and widely used in industrial applications - Thermocouples can be built into most heating elements found in our catalogue
RTD ADVANTAGES
- RTD's typically have wider temperature ranges (300°F to 1200°F (“J”) than thermocouples
- RTD's are generally more accurate than thermocouples— especially in area sensing
- RTD element follows a more linear curve than thermocouples
- RTD's are usually lower in cost than typical thermocouples
- RTD's are stable, reliable performance especially in laboratory environments than are thermocouples
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